Improvement in extension-table slides



geen. dem.

ALBERT H. sHPMAN, or ARGADIA, NEW-Youri.

Letters Patent No. 96,533, dated November 2, 1869.y

IMPROVEMENT 1N ExTEnsIoN-TABLE sLrDEs.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom itanay concern:

Be it known that I, ALBERT H. SHIPMAN, of Arcadia, in' the county of Wayne, and State of New York, have invented certain new and useful Improvel ments in Extension-Table Slides; and I do hereby declarethat the following is a full, clear, and exact description ofthe same, reference being had to the accompanying drawings, which make part of this specitication, and in whichv Figure l represents a plan showing. three bars of an eXtension-s'lidei Figure 2 represents a horizontal section ofthe same, taken through the grooves and slides of the bars; n rFigure 3 represents a transverse section ofthe same; Figure 1 represents a plan ofthe grooved side of one of the bars; and

Fig-ure- 5 represents a view, in perspectiveof the metallic tonguedslide, detached from its bar.

In the accompanying drawings- A represents the bars attached to the ends of the table, and

B, the intermediate bar, supported by and sliding between the end-bars.

These bars are, of course, arranged on each side of a table in the usual manner, and a greater or less nuliiber may be4 used, according to the length of the ta e.

I am aware that metallic slides have been fitted in a groove formed in the centre of each bar of'an eX- teusion-slide, so as to form stops thereto, having the form of a double dovetail, and that the bars have also been united together by slides secured to the outer side of the bars, so as to slide within outside grooves, but the .latter arrangement is so frail that the shoulders ofthe bar, between the lips of the slide, often break oli` and render the table comparatively useless, and necessitates the retting therein of a new bar, while a single central groove, with its slide, does not give to the bars that strength and rigidity which are required. t

My improvements are designed to obviate these defects, and to produce an extension-slide, rm, durable,

and simple in construction, and'consist in constructingl the. metallic slides C with two fparallel tongues a,

projecting from the same side thereof, so as to leave shoulders c, thereon, contiguous to said tongues, and

at right angles' thereto, thereby forming a bracing houlder to each tongue, within the groove b of each One side of each slide C, thus constructed,is made thicker than the other, namely, that side which is secured in the groove b, iu order to allowit to be driven tightly into said groove, while the other side is of less thickness, to alloiait to more freely within the groove b of the adjacent bar, as shown in figs. 3 and 5.

lhe slide thus inserted'is fastened by a pin, e, driven ,into the bar against the face of said slide, through a notch, d, in the tongue, as shownin figs. 3 and 5.

The tongues a are fitted into groovesin the bars A B, and ,serve to ylock them together; and in order to enable them to slide .within the grooves,` and prevent the bars from wabbling, the right-angled shoulders c are formed adjacent thereto, which give a firm bearing to the `slide C.

Each slide is notched or recessed at each end at f,

in order that it may strike against a pin, g, inserted into and crossing the grooves 1),.as shown in fig. 2, so as to form a stop to the bars A B, not liable to be torn out of the grooves, and to allow the ends of said bars to come ilush when they are brought together in closing the table.

` These slides O are secured in the ends of the bars A B, so as to slide within the grooves b, made above and below vthe centre of each bar; and from this arrangement i-t will be seen that4 when the bars are extended, the pair of slides at the end of one bar, forms a perfect support and brace to the slides of the adjacent bar, and thus gives a firmness to said baiswhich cannot possiblyY be obtained by' a single slide in each bar, or whigh cannot be obtained by plates screwed on the outer opposite sides of the bars.

It has been found by experience that a flatl plate,

forming part of the "slide, and fitted so Aas to slide and oier a considerable surface to the adjacent sides of the bars, while it eiectually separat-es the two, So as to form a space between them, does not, 'however, prevent the binding which it was intended to remedy. v

Moreover, in securing the bars together, if they should bind'at any part of their length, the plates ject between tlle bars, and offer to the adjacent bar a i small round bearing-point, whereby it for it to bind between said bars.

vIn addition to this, if the bar should be warped or Vthe grooves b of unequal depth, the round-headed pins c' afford the greatest facility in making the slides vto move without binding, by'siniply driving either one is impossible o1' the other into the bar until the 'inequality isvcompensated for.

The use,`therefore, of a simple round-headed pin, which may be adjusted into the bar to a greater or leSs'depth, it is apparent, possesses many advantagesl over a dat plate, admitting of no adjustment.

Having described my invention,

I claiml purpose of presenting :L convex bearing-point', for the 1. The metallic slides C, made thicker ab one side adjacent bar, and admitting'adjustment, as described. than :it the other, and provided with tongues a, shoul- In testimony whereof, I have signed my name. ders c, and notches or recesses f, in combination with ALBERT H. SHIPMAN. ban-s A B, having grooves b and pins g, as herein de-Y scribed, for the purpose specified. Witnesses:

2. The hars A B, separated and held apart by T. H. UPPERMAN, means cfa common round-headed pin, fi, for the double A. E. H. JOHNSON. 

